build(deps): update Node.js versions for CI builds

re2 no longer works for NodeJS v14 and thus the CI fails for all new PRs

NodeJS v16 has also dropped out of support

Fixes ajv-validator#2330

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 16.x, 18.x, 19.x]
+        node-version: [18.x, 20.x, 21.x]
 
     steps:
       - uses: actions/checkout@v2